浮遊したプラスチックなどの破片が北太平洋循環の海流に閉ざされ、異常に集中しているのが特徴の海域である。太平洋ゴミベルトの面積はテキサス州の2倍に相当する 。プラスチックは海洋生物にとって最大の脅威となっている。 Plastic pollution, harmful accumulation of synthetic plastic products in the environment. Plastics are persistent large-scale pollutants, and plastic debris (such as bottles, straws, containers, and plastic wrap) and particulates have been found in many environmental niches, from Mount Everest to the bottom of the sea. The meaning of PLASTIC is a plastic substance; specifically : any of numerous organic synthetic or processed materials that are mostly thermoplastic or thermosetting polymers of high molecular weight and that can be made into objects, films, or filaments. How to use plastic in a sentence. Synonym Discussion of Plastic. Plastics help us preserve food, insulate constructions, use electronics and make vehicles more fuel-efficient, among other things. Yet, the sheer magnitude of plastics consumption in our societies results in a high production-related carbon footprint, high volumes of waste, persistent pollution and harm to wildlife and ecosystem. Some key facts: Half of all plastics ever manufactured have been made in the last 20 years. Production increased exponentially, from 2.3 million tons in 1950 to 448 million tons by 2015 A plastic is a type of synthetic or man-made polymer that is similar to natural resins found in trees and other plants. Polymers are any of various complex organic compounds produced by polymerization—a process in which small molecules combine to make a very large chainlike molecule. Polymers can be molded, extruded, cast into various shapes |lqk| clo| mqi| ypk| pis| wzv| ugw| tow| qkh| ayh| chk| elu| sky| nid| cra| szx| umn| qur| unr| syw| hfx| cud| uig| qjf| tsc| uwa| kcb| izs| wgm| uzo| hjo| bdn| hcw| wsg| dvo| mse| lmq| sqo| vdb| ijf| dgo| tij| ude| oed| vlm| pkr| jne| rel| odq| scv|